Finding the Fourth Proportional to 8,485.89, 11,710.23 and 5,128.11

Step by Step Solution

1. Step 1: Write the proportion equation
   8,485.89 : 11,710.23 = 5,128.11 : x
2. Step 2: Convert to fraction form
   8,485.89/11,710.23 = 5,128.11/x
3. Step 3: Cross multiply
   8,485.89x = 11,710.23 × 5,128.11
4. Step 4: Simplify right side
   8,485.89x = 60,051,347.57
5. Step 5: Solve for x
   x = 60,051,347.57/8,485.89
6. Step 6: Final answer
   x = 7,076.61